Last friday I observed that the coil driver (#4) used to control the input mirror was not working properly. It also made the crete produce an alarm sound when connected. We have replaced it with another coild driver (#1). In order to do it, we had to restore the connector number 4 that was missing in that coil driver.

We dispose of 6 coil drivers, originally used in TAMA, which are numbered from 1 to 6. (#2 is actually not numbered)

Here a recap on the coil drivers used for filter cavity and input telescoope mirrors.  (See also attached pictures)

Coil driver #1:  used for the INPUT MIRROR  (connector 4 was missing and had to be replaced)

Coil driver #2:  used for the BS TELESCOPE (it is actually not numbered)

Coil driver #3:  not used  (probably is not working properly, to be checked)

Coil driver #4:  not used (previously used for the INPUT MIRROR but it deesn't work anymore)

Coil driver #5:  used for PR TELESCOPE

Coil driver #6:  used for the END MIRROR